Revert of Consolidate GPU buffer implementations

src/gpu/batches/GrVertexBatch.h

Index: src/gpu/batches/GrVertexBatch.h
diff --git a/src/gpu/batches/GrVertexBatch.h b/src/gpu/batches/GrVertexBatch.h
index 2af4dd1caddeb96abbf9d0d172471d1d954df72d..16ba603962a4473b746ee3bfbab8e04a23f38444 100644
--- a/src/gpu/batches/GrVertexBatch.h
+++ b/src/gpu/batches/GrVertexBatch.h
@@ -35,7 +35,7 @@
         /** Returns the allocated storage for the vertices. The caller should populate the before
             vertices before calling issueDraws(). */
         void* init(Target*, GrPrimitiveType, size_t vertexStride,
-                   const GrBuffer*, int verticesPerInstance, int indicesPerInstance,
+                   const GrIndexBuffer*, int verticesPerInstance, int indicesPerInstance,
                    int instancesToDraw);
 
         /** Call after init() to issue draws to the batch target.*/